31220124413 has 4 divisors (see below), whose sum is σ = 31221707040. Its totient is φ = 31218541788.

The previous prime is 31220124389. The next prime is 31220124461. The reversal of 31220124413 is 31442102213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31442102213 = 24469 ⋅1284977.

It is a cyclic number.

It is not a de Polignac number, because 31220124413 - 2⁶ = 31220124349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220123413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761345 + ... + 801302.

It is an arithmetic number, because the mean of its divisors is an integer number (7805426760).

Almost surely, 2^31220124413 is an apocalyptic number.

It is an amenable number.

31220124413 is a deficient number, since it is larger than the sum of its proper divisors (1582627).

31220124413 is a wasteful number, since it uses less digits than its factorization.

31220124413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582626.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31220124413 its reverse (31442102213), we get a palindrome (62662226626).

The spelling of 31220124413 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-four thousand, four hundred thirteen".